function tab(tabla, tab)
{

	if (navigator.appName == "Microsoft Internet Explorer") {

		
		var tab1 = document.getElementById("tab" + tabla.toString() + "1");
		var tab2 = document.getElementById("tab" + tabla.toString() + "2");
		var fila1 = document.getElementById("fila" + tabla.toString() + "1");
		var fila2 = document.getElementById("fila" + tabla.toString() + "2");
		

		
		if (tab == 1) {
			tab1.childNodes[0].style.display = "block";
			tab1.childNodes[1].style.display = "none";
			tab2.childNodes[0].style.display = "none";
			tab2.childNodes[1].style.display = "block";
			
			tab1.className = "tab_front";
			tab2.className = "tab_back";
			fila1.style.display = "block";
			fila2.style.display = "none";
			
		}
		
		else 
			if (tab == 2) {
				var i;
				
				//document.writeln(tab1.childNodes[1].tagName);
				
				
				
				tab1.childNodes[0].style.display = "none";
				tab1.childNodes[1].style.display = "block";
				tab2.childNodes[0].style.display = "block";
				tab2.childNodes[1].style.display = "none";
				
				tab1.className = "tab_back";
				tab2.className = "tab_front";
				fila1.style.display = "none";
				fila2.style.display = "block";
				
			}
			
	}
	
	
	else {
	
		tab1 = document.getElementById("tab" + tabla.toString() + "1");
		tab2 = document.getElementById("tab" + tabla.toString() + "2");
		fila1 = document.getElementById("fila" + tabla.toString() + "1");
		fila2 = document.getElementById("fila" + tabla.toString() + "2");
		
		
		if (tab == 1) {
			tab1.childNodes[1].style.display = "block";
			tab1.childNodes[3].style.display = "none";
			tab2.childNodes[1].style.display = "none";
			tab2.childNodes[3].style.display = "block";
			
			tab1.className = "tab_front";
			tab2.className = "tab_back";
			fila1.style.visibility = "visible";
			fila2.style.visibility  = "collapse";
			
		}
		
		else 
			if (tab == 2) {
				tab1.childNodes[1].style.display = "none";
				tab1.childNodes[3].style.display = "block";
				tab2.childNodes[1].style.display = "block";
				tab2.childNodes[3].style.display = "none";
				
				tab1.className = "tab_back";
				tab2.className = "tab_front";
				fila1.style.visibility = "collapse";
				fila2.style.visibility = "visible";
				
				//fila1.style.display = "none";
				//fila2.style.display = "block";
			}
		
	}

}